PHYSICS JAMB QUESTION 1. The bond between Cu²+ and H2O is .... 2. The gas liberated when an aqueous (NH4)2CO3 reacts with NaOh is ..... 3. The organic compound that give positive iodoform test is..... 4. The observable oxidation of sulfur in all its compound range from....... To ....... 5. Solid dispersed in liquid is.......... 6. The product formed when stearic acid and sodium hydroxide react are ....... 7. In the extraction of aluminum the silica impurity is removed by........ 8. The wing of a bat and that of a bird is an example of ....... 9. The process by which nutrients are absorbed from the environment and utilized is....... 10. A horse shoe magnet is an example of...... 11. A hole and an electron in close proximity would tend to...... 12. As water cools in a lake during winter the surface is frozen why the bottom still harbours lives because of....... 13. Thermoelectric thermometer works on principle of....... 14. High voltage is used for power transmission to reduce....... 15. What is responsible for the formation of secondary rainbow in a rain invent

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  1. The bond between Cu²⁺ and H₂O is a coordinate covalent bond (or dative bond).
  2. The gas liberated when an aqueous (NH₄)₂CO₃ reacts with NaOH is ammonia (NH3\text{NH}_3).
  3. The organic compound that gives a positive iodoform test is one containing a methyl ketone (CH3CO-\text{CH}_3\text{CO-}) or methyl carbinol (CH3CH(OH)-\text{CH}_3\text{CH(OH)-}) group. An example is ethanol.
  4. The observable oxidation of sulfur in all its compounds ranges from −2-2 to +6+6.
  5. Solid dispersed in liquid is a sol (a type of colloid) or a suspension.
  6. The products formed when stearic acid and sodium hydroxide react are sodium stearate (soap) and water.
  7. In the extraction of aluminum, the silica impurity is removed by forming sodium aluminosilicate (in the Bayer process).
  8. The wing of a bat and that of a bird is an example of analogous structures.
  9. The process by which nutrients are absorbed from the environment and utilized is assimilation (or metabolism).
  10. A horseshoe magnet is an example of a permanent magnet.
  11. A hole and an electron in close proximity would tend to attract each other.
  12. As water cools in a lake during winter, the surface is frozen while the bottom still harbors lives because of the anomalous expansion of water (water is densest at 4∘C4^\circ\text{C}).
  13. A thermoelectric thermometer works on the principle of the Seebeck effect (or thermoelectric effect).
  14. High voltage is used for power transmission to reduce power loss (due to resistance, P=I2RP = I^2R).
  15. The formation of a secondary rainbow in a rain event is responsible for two internal reflections within the water droplets.
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